import React, {Component} from 'react';
// 1- 引入context
import globalContext from "../context";
class B extends Component {
    // 2- 创建一个名字为contextType的静态属性，值为globalContext
    static contextType = globalContext;
    render() {
        // console.log(this.context)
        const {userName,age,changeUserName} = this.context;
        return (
            <div>
                <h3>B->得到的参数</h3>
                <button onClick={()=>{
                    changeUserName(userName+"b");
                }}>B->更改userName</button>
                <p>userName:{this.context.userName}|{userName}</p>
                <p>age:{this.context.age}|{age}</p>
            </div>
        );
    }
}

export default B;